Play Inferno Missile Retrofit only on a 'Mech. That 'Mech gains AP (Enhanced 'Mech deals +1 damage to any target other than a 'Mech.).

Choose a 'Mech opponent controls. If that 'Mech receives any damage
from 'Mech enhanced with Inferno Missile Retrofit, that 'Mech
receives additional damage equal to double the damage of its Overheat
option. Use this ability only during battle.

You may deploy Inferno Missile Retrofit revealed to make an
additional deployment this turn.